Question

part 1: read the following information on elements, compounds and mixtures. circle or fill in the correct term for each blank where necessary. elements: - a pure substance containing only one kind of atom - an element is always uniform all the way through (homogeneous). - an element can / cannot be separated into simpler materials (except during nuclear reactions). - over 100 existing elements are listed and classified on the periodic table compounds: - a pure substance containing two or more kinds of atoms - the atoms are chemically/physically combined in some way. often times (but not always) they come together to form groups of atoms called molecules. - a compound is always homogeneous (uniform). - compounds can / cannot be separated by physical means. separating a compound requires a chemical reaction. - the properties of a compound are usually different than the properties of the elements it contains. mixtures: - two or more ________ or ______ not chemically combined. - no reaction between substances - mixtures can be uniform (called ______) and are known as solutions - mixtures can also be non - uniform (called ________). - mixtures can be separated into their components by chemical or physical means - the properties of a mixture are similar to the properties of its components. part 2: classify each of the following as elements (e), compounds (c) or mixtures (m). write the letter x if it is none of these. diamonds (c) sugar (c6h12o6) milk iron (fe) oxygen (o) sulfuric acid (h2so4) gasoline electricity hydrogen (h) bismuth (bi) uranium (u) popcorn water (h2o) alcohol (ch3oh) pail of garbage a dog helium (he) salt (nacl) energy gold (au) carbon (c) bronze ink pizza air vinegar (co) baking soda (nahco3) titanium (ti) concrete modified from http://pdfdb.com/doc/elements - compounds - and - mixtures - worksheet - 4379078zhtn

Explanation:

Step1: Recall element definition

An element is a pure - substance with only one kind of atom and cannot be separated into simpler materials by non - nuclear means. Elements are listed on the periodic table. Iron (Fe), Uranium (U), Bismuth (Bi), Gold (Au), Titanium (Ti) are elements.

Step2: Recall compound definition

A compound is a pure substance with two or more kinds of atoms chemically combined. It cannot be separated by physical means. Sugar ($C_{6}H_{12}O_{6}$), Sulfuric Acid ($H_{2}SO_{4}$), Alcohol ($CH_{3}OH$), Salt (NaCl), Baking Soda ($NaHCO_{3}$) are compounds.

Step3: Recall mixture definition

A mixture is two or more substances not chemically combined. It can be separated by physical or chemical means. Milk, Gasoline, Popcorn, A dog, Pail of Garbage, Ink, Pizza, Concrete are mixtures.

Step4: Analyze non - applicable cases

Electricity and Energy are not elements, compounds or mixtures as they are forms of energy, not substances in the traditional chemical sense.

Answer:

Diamonds (C): E
Sugar ($C_{6}H_{12}O_{6}$): C
Milk: M
Iron (Fe): E
Sulfuric Acid ($H_{2}SO_{4}$): C
Gasoline: M
Electricity: X
Nitrogen (N): E
Bismuth (Bi): E
Uranium (U): E
Popcorn: M
Mercury (Hg): E
Alcohol ($CH_{3}OH$): C
Pail of Garbage: M
A dog: M
Salt (NaCl): C
Energy: X
Gold (Au): E
Bronze: M
Ink: M
Titanium (Ti): E
Baking Soda ($NaHCO_{3}$): C
Pizza: M
Concrete: M